Triangular sequence of coefficients from the expansion of p(x,t)=Tan(x*t)/Tan(t).

Terms

a(0) =0a(1) =1a(2) =0a(3) =-4a(4) =0a(5) =4a(6) =0a(7) =-64a(8) =0a(9) =-320a(10) =0a(11) =384a(12) =0a(13) =-7680a(14) =0a(15) =-26880a(16) =0a(17) =-161280a(18) =0a(19) =195840a(20) =0a(21) =-3096576a(22) =0a(23) =-10321920a(24) =0a(25) =-43352064a(26) =0a(27) =-263208960a(28) =0a(29) =319979520